This goes for Stukas, Pwerfers, Katyushas. Only these three units are very weak. Meaning if you do get behind the lines, one or two shots is enough.
With the Calliope however, you have to stay around and chase it. This makes it much less likely you can kill a calliope and more likely you'll lose your unit even if you do.
And my point is that if there are skilled players fighting each other, they are both skilled enough to avoid being caught offguard with their artillery. In that case the amount of hp of those units becomes irrelevant.
You can lose your game by losing your artillery units, but you should not assume to lose a game because you failed to take out the enemy's mobile arty, especially when playing axis (who just happen to be the one to face the Calliope).
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cblanco ★ 
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VonManteuffel 
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